Fluid-operated pump



ug- 13, 1931. P, F. YUNGLING l FLUID OPERATED PUMP Filed June 27. 1928 4 Sheets-Shes?I 1 Aug. 18, 1931.

' P. F. YUNGLING FLUID OPERATED PUMP Filed June 27, 1928 4 Sheets-Sheet 2 l Il Aug. 18, 1931. P. F. YUNGLING FLUID OPERATED PUMP Filed June 27. 1928 4 Sheets-Sheet 3 Aug. 18, 1931. P. F. YUNGLING FLUID OPERATED PUMP Filed June 27, 1928 4 Sheets-Shea?l 4 .I 37,' EME 2 nlo lll Il, s 0/8 8l 758 .00 Y D A/ mW n N n 9a/IV l 9 El. T V V/ L l I [Il @Ah .NIH A m. 2u l 7 6 2 Patented Aug. 18, 1931 STATES PATENT OFFICE PAUL F. YUNGLING, OF LOS ANGELES,CALIFORNIA, ASSIGNOR TO SCOTT-ROSS AND COM- PANY, F LOS ANGELES, CALIFORNIA, A CORPORATION OF DELAWARE Application fil-ed June 27,

This invention relates to fluid-operated pumps of the type employed, for example, in oil wells, and an important object is to improve the operation of this type of pump.

This invention is an improvement over the fluid-operated pump disclosed in my Patent No. 1,764,482, granted June 17, 1930, and an important object of the present invention is to materially reduce the friction on the power fluid. In the above mentioned prior application, the pump employs two lines of pipe inside of the well casing, an outer pipe or tubing for the oil that is being raised from the well and an inner pipe or macaroni, as it is generally termed, for induction of the power fluid from the surface pump to the cylinder of the pump in the well. In the present construction, I eliminate the macaroni, of comparatively small diameter, and, instead, elevate the oil through the annular spacel that lies between the well casing and a tubing through which the power fiuid is inducted. By this construction, as is readily understood, I employ but two lines of pipe, the same as is employed in wells that are pumped with a pump that is operated by sucker rods. Since pump the oil through the casing, I reduce the fluid friction between said oil and casing by a considerable amount and, further. more, since only one string of tubing is required inside of the casing. the said string may be made of considerably larger diameter than the macaroni tubing formerly employed, thus materially reducing the fluid friction -of the power fluid on the inner tubing.

Another object is ease of installing of the pump in the well and removal of the pump from said well.

Other important objects and advantages will appear in the subjoined detailed description. i

The accompanying drawings illustrate the invention.

Figures 1 to 4 inclusive are vertical sections of a construction embodying my new fluid-operated pump, portions being broken away to contract some of the views. The views taken in numerical order represent 1928. Serial No. 288,691.

successivev portions of the at the upper end thereof.

Figure 5 is a horizontal section on the line indicated by 5-5 of Figure 4.

Figure 6 is a fragmental vertical section showing the packer elements in the positions they occupy prior to seating of the packer.

Figure 7 is a diagrammatic sectional view showing the valves, the ports controlled by said valves and the duc-ts or passages in the valve body.

Figures 8, 9 and 10 are enlarged horizontal sections on the lines indicated by 8*8, 9`9, 10u-10, respectively, in Figures l, 2 and 3, respectively. Y

Figure 11 is a broken vertical midsection combining Figures 1 to 4, inclusive, the diameters of some of the parts relative to their lengths being exaggerated.

Figure 12 is a longitudinal midsection of the valve mechanism, fragments of tubing being indicated in broken lines and connected with said mechanism.

Figure 13 is a longitudinal section taken on a plane at substantially ninety degrees from the plane of section of Figure 12.

pump beginning Figure 14 is a horizontal section on the line indicated by 14-14, Figure 12.

Figures 15 and 16 are horizontal sections on the lines indicated by 15-15, 16-16, respectively, Figure 13.

Figure 17 is a fragmental sectional detail of the connection between one of the heads and one of the tubular sections of the valve mechanism.

Figure 18 is a fragmental sectional detail on the line indicated by 18-18, Figure 12.

There are provided an inner and an outer string of pipe or tubing, the inner string 15 being that through which the power Huid is inducted and the outer string 16 being that through which the oil or other fluid, produced by the well, is pumped. The tubing 16 is generally termed a well casing and, where it passes through the producing strata, is provided with perforations 17 to admit the well fluid into the interior of the casing. As is general, there is provided an Lunperforated portion 18 of the casing below the perforations so as to insure, as far as posmechanism and the lower end of 'a'motorv cylinder 28 that is positioned inside of and,

sible, against the entrance of gas, sand and the like into the casing.

Above the p erforatious 17 I provide a packer, indicated in general at 19, to separate the well fluid induction space 20 below the packer from the well {iuid eduction or pumping space 21 above the packer. The packer 19, though it may be of any suitable construction, will be described more in detail hereinafter in order to make clear how the packer is set and loosened.

The pump tubing 15, which constitutes the conduit for the power fluid, extends through the packer 19 and has its lower end forming a sleeve 22 that closely fits and is ltelescoped over a tubing section 23 which,

preferably, is provided with a perforated portion 24, that has an outside diameter that is less than the inside diameter of that portion of the tubing 15 that is positioned `adjacent to the perforated portion 24 so that power fluid can freely pass downwardly around the perforated portion and through the perforations to the interior of the tubing section 23. The power fluid, owing to the relatively tight fit between the sleeve 22 and tubing section 23, is prevented from going further down the well.

The lower end of the tubing section 23 is connected, to a casing or housing 25 of a suitable valve mechanism which is indicated in general by character 26. The details of construction of the valve mechanism 26 will be described hereinafter. This valve mechanism is the subject of my copending application filed June 13, 1928, Serial Number 285,025.

The lower end of the caslng 25 is connected to a tube 27 that forms a conduit for the passage of power fiuid between the-valve preferably, concentric of the tube 27 The cylinder 28 is provided near its lower end with ports 29 communicating the interior of the cylinder with the annular space 30`that lies between the cylinder and the tube 27.

The lower endv of the cylinder 28 isl closed.

by a plug 31.

Belowr the tube 27, and also below the cylinder 28 and connected thereto, is a pump working barrel 32 and at the lower end of the working barrel is a standing valve 33 of any suitable or well known construction. In this instance, connected with the standing valve 33, and projecting downwardly therefrom, is a gas anchor. 34 which mayl be omitted, in case its useis not required. The gas anchor 34 is customarily provided with perforations 35 through which the well fluid passes from the interior of the casing to the interior of the gas anchor. Y

I Working in the working barrel 32, is a pump plunger36 provided, in'this instance, at its lower end with a valve'37 and at its v piston.

' 38 may be of any well known type of plunger valves and, in fact, the working barrel and plunger may be of any suitable well known type. x

Working within the cylinder 28 is a piston 39 which is positively connected with the pump plunger, in this instance, by a connecting rod comprising upper and lower sections 40, 41 of different diameters, the upper section having the smaller diameter and the lower section having the larger diameter. The lower section 41 has a sliding lit in an upward extension 42 of the working barrel and, in fact, the ro-d section 41 constitutes an upward extension of the pump plunger as it, alsofunctions as a plunger, since it pumps the well fluid on its downstroke. vThe rod sections 40, 41 constitute a stepped. connecting rod, the advantage thereof1 being that .it thereby cuts down the volume of liquid that is pumped on the upstroke of the plunger while, at the same time, providing for a relatively great cross sectional area of the bore of the cylinder so that the power fluid will be more effective in raising the piston. It will be noted that the cross sectional area of the connecting rod section 41 that enters the working barrel is, preferably, about one half of that of the plunger sothat the volumes of liquid discharged on the up and down strokes of the plunger will be approximately equal, thus to keep the fluid column moving constantly and avoiding settling of sand and other foreign, solid particles that may be in the fluid column. up of the pump. By keeping the fluid column moving constantly, economy in the use of power results since it is not necessary to overcome the inertia of a stationary column of liquid as would be the case ,if the fluid column were raised on only the up stroke of the plunger. The connecting rod section 4() has a close sliding fit in a sleeve 43 that is positioned in the upper end of the extension 42.

A suitable means is provided for connecting the piston with thevalve mechanism 26 so as to effect operation of said valve mechanism upon the up and down'motion of the These means, in this instance, include a lost motion device comprising a rod 44 projecting through the upper head 45 of the cylinder, the upper end of Said rod connecting with the moving parts of the valve mechanism. The rod 44 is provided with a lower shoulder 46 and an upper shoulder 47, said shoulders, in this instance, being in the form of coil springs surrounding and connected with the,rod 44. The

shoulde`r47 engages the -outer end of the This prevents sanding ton.

The lost motion connection is provided, in this instance, ticulary construction of the Valve mechanism and is only suiiiciently described so that the operative connection between the piston and valve mechanism will be understood.

Referring more particularly to Figure 7, which is merely a diagrammatic view, the valves of the valve mechanism are indicated at 48, 49, 50 and 51. The valves 48, 49 control ports 52, 53, respectively, that open downwardly from the interior of the tubing section 23. The valve 50 controls a port 54 that communicates at its lower end with the annular passage 30 and that communicates at its upper end with an annnular passage that is formed between the valve mechanism casing 25 and a tube 56 that is positioned inside of and spaced from the casing 16. The tubing 56 has a leak-proof connection at its upper end with the packer 19 and at its lower end with a seat member 57. The tubing 56 separates the annular passage 55 from the well fluid induction space 20.

The valve 51 controls a port 58 that communicates at its lower end with the interior of a tube 59 that has a liquid-tight connection at its upper end with the valve mechanism and at its lower end with the'upper end of the cylinder. The upper end of the port 58 communicates with the annular passage 55. The bore of the tubing 59 thus forms aconduit for inducting the power fluid between the valve mechanism and the upper end of the cylinder.

Since the bore of the working barrel extension 42 is of considerably larger diameter than the bore of the sleeve 43, there is formed a space 60 inside of the extension 42, between the lower end of the sleeve 43 and the upper end of the connecting rod section 41 and, accordingly, it is advisable to provide a' breather for said space. Such breather, in this instance, is formed of one or more laterally extending tubes 61 that communicate at their inner ends with the space 60 and that pass through the tube 56 and communicate at .their outer ends with the annular passage 55. Thus, the rod section 41 on its upstroke works against a fluid pressure that is only that of the well.

The packer 19, in this instance, is constructed as follows:

There is an inner packer member 62 forming an outwardly projecting annular shoulder 63, and there is an outer packer element 64. The upper end of the element 64 forms a shoulder 65. Between the shoulders 63 and 65 is the packing 66, preferably of readily disintegratable material such, for example, as metallic packing. The lower portion of the packer element 62 is provided with external screw threads 67 adapted, when the elements 62, 64 are relatively posibecause of the par' tioned as in Figure 6, to engage the internal screw threads 68 in the upper end of the section 64. The element 62 has an unthreaded portion 69 extending from the threads 67 to the shoulder 63, so that when the element 62 is turned in a direction to screw it downwardly on the section 64, the screw threads 67 will disengage the screw threads 68 and permit the-element 62 to be forced downwardly so as to compress the packing against the outer face of the element 62 and inner face of the casing v16. Forcing of the ele-V ment 62 downwardly is effected by en- @agement therewith of an external shoulder 70 on the tubing 15. Thus, the packer can be set by permitting the entire weight of the tubing 15 to be imposed upon the element 62. There is a spline connection between the tubing 15 and the packer element 62 so as to permit of longitudinal movement of the tubing A15 within the element 62 and so that rotation of the element 62 can be effected, when desired, by turning the tubing 15. The spline connection, in this instance, comprises splines 71 mounted longitudinally on the tubing and grooves 72 in the element 62 to receive the splines 71.

In order to loosen the packer 19, when it is desired to pull the pump, the lower end of the tubing-portion 73 that slides over the section 23 is provided with an external shoulder 74 adapted, when the tubing section 73 is raised to the position shown in Figure 6, to engage the lower end of the packer element 62 so as to raise said packer section, the weight imposed on the section 62 having been removed when the tubing section 73 is raised, because of the shoulder 70 being lifted off the section 62. It will be readily seen that after the packer has been thus loosened, the entire pump can be pulled from the well by pulling up on the tubing 15, since the weight of all of the pump parts below the shoulder 74 is imposed on said shoulder. In this particular instance, the shoulder 74 is formed by the upper end of a collar75, that is screw threaded onto the lower end of the tubing section 73. When the tubing 15 is thus raised to withdraw the pump, the packing 66 is disintegrated by friction thereof against the inner face of the casing 16, thus freeing the packer so that there is no difficulty in pulling the same out with the pump. There is a slight clearance 76 between the packer section 64 and the inner face of the casing 16, so that some of the disintegrated packing can readily pass through said clearance, when the packer is pulled upwardly. The lower end of the tube 27 is sealed by a nut 761 which is screwed onto the lower end of the plug 31. The lfluid being pumped can pass upwardly through the formed in the packer element 62. Thus said fluid can pass into the casing.

' On the seat member 57 is adapted to removably seat a reducing coupling 77 which is screw threaded onto the lower end oty a nipple 78 that is screw threaded into the lower end of the working barrel extension with the bore of the tube 56 are ports 81.

The lower end of the bore 80 communicates with the upper end of the workingvbarrel.

The upper end of the casing is closed by a head 83, the interior of which communicates with a pipe line 84 by which the pumped fluid may be conducted to any desired place. The head 83 is provided with a stuling box 85 which surrounds the tubing 15 that projects upwardly through said stufling box. The upper end of the tubing 15 is adapted to be connected to a suitable pump, the source of the power fluid that is under pressure for operating the pump.

The body of the valve mechanism 26 comprises a number of sections, an upper section or head 109, a lower section or head 110, and tubular intermediate sections 111, 112, which connect passages 113, 114 in the head 109 with passages 115, 116, respectively, in the head 110. T o secure the members 111, 112 to the heads, the ends of the sections 111, 112 are provided with ends 117 that telescope into recesses 118 formed in the heads 109, 110, there being shoulders 119 on the sections 111, 112 outside of the ends 117 for the heads 109, 110 to seat against. Copper gaskets 20 are placed in the recesses 118 between the ends 117 and the heads.

vided with flanges 121 in which are holes 122 to receive studs 123 that project from the heads, nuts 124 on said studs seating against the flanges 121 to hold said flanges securely to the heads.

The port 58 communicates with the passage 113 and the port 52 opens to the upper end of the head 9 and communicates with the passage 14. The port 58 opens to the lower end of the head 110 and also to the periphery of said head. The port 54 opens to the periphery of the head 110 and communicates with the chamber 33 in which the head of the valve 50 is positioned. Con'- nected with the head 110 is a tubular member 27, which affords an annular passage 135 communicating with the chamber 133. This passage 135 is intended to connect with Near their ends, the sections 111, 112 are proone end of the cylinder of the pump as will appear hereinafter.

The sections 111, 112 are spaced, and in the space thus formed is mounted the mechanism that operates the stems of the valves. The stems 136, 137 o the valves 49, 48 project downwardly through the head 109 into a chamberA 138 which is formed between the heads 109, 110 and cover plates 139 Secured by screws 140 to the heads 109, 110. The

fstems 141, 142 of the valves 51, 50 project upwardly through the head 110k and into the 'chamber 138. The tubular sections 111, 112 are also positioned in the chamber 138.

In the space between the sections 111, 112 are mounted cams 143, 144 which are caused to rock by a pin 145 that .projects through cam slots 146, 147 in the cams 143, 144, respectively. The pin 145, in this instance, carries rollers 148 so as to minimize friction, the bearing othe cams being on said rollers.

The rollers are on the end portions ofthe pin 145 and the middle portion of said pin is screwed into a slide 149 that lmoves in guide grooves 150 formed in the inner faces of the cover plates 139. The slide 149 is provided at one end axially thereof with a longitudinally extending slot 151, through which extends a pin 152 whose ends are secured incover plates 153., The pin 152 and slot 151 constitute a lost motion connection between the slide A149 and a universal joint'154, whichserves to connect the lost motion connection with the rod 44 that passes axially through the head 110, being shiftably mounted in said head. The uni versal connection 154 comprisesa fork 156 'formed on the upper end of a link 157, a

pin 158 connecting the fork 156 and slide 149, a fork 159 formed on the lower end of the link 157, and apin 160 connecting the fork 159 with a socket member 161 into which `the rod44 is screwed.

The cam 143 includes a pair of rollers 162, 163 which bear against the lower ends of the valve `stems 136, 137, and the cam 144 includes rollers 164, 165 that bear against the upper ends of the valve stems 141, 142. The cam slots 146, 147 are arranged at an angle with reference to the longitudinal axes of the cams so that rocking of the cams is produced when the slide 149 is moved longitudinally by actuation of the rod 44. The cam'143 rocks on a pivot 166, the ends of which are seated in the cover plates 153, and the cam 144 rocks on the pin.152. The cover plates 153 are secured by screws 167 to the cover plates 139, and all of said cover plates constitute portions of the body 108. l

The valves are retracted by coil springs 168, which always tend to hold the val stems engaged with the several rollers vwhich actuate them. The springs 168 surround the valve stems the heads 109, 110, as the case may be, and against spring seats, or abutments, 169 secured to the valve stems.

Surrounding the adjacent ends of the heads 109, 110 and closely fitting said heads, is a tubular housing or casing 25, the lower end of said casing seating against an annular shoulder 171 on the head 110, and the upper end of said casing being engaged by the lower end of a nut 172 which is screwed onto the head 109. This nut 172 secures the casing 25 in place.

The upper end of the head 109 is screwthreaded at 175 so that the tubing 23, carrying the power fluid, can be screwed on to said. head. The lower f head is screwthreaded at 174 so that the cylinder 28 can be screwed thereon, the outside diameter of the cylinder being less than the' inside diameter of the tubing 27 so as to produce the annular passage 30 for the operating Huid, as will be made clear hereinafter.

As stated above, the tubing 27 connects with one end of the cylinder of the pump and the cylinder 28 will connect with the other end of said cylinder.

A means is provided to releasably hold the rod 44 in two different positions against longitudinal movement. For this purpose the rod 44 is provided with an enlargement 176 containing in its periphery a series of notches 177 adapted to be engaged by detents 17 8 positioned at opposite sides of the rod. The detents on each side will be one less than the number of notches on each side and, though the detents and notches may be provided only on one side, I have shown them on both sides. The detents 178 are yieldingly held in some of the notches by coil springs 179 mounted in spring chambers 180 formed in the head 110. In this particular instance, the head 110 isiconstituted by two sections joined by a coupling 181 and the two head sections are spaced to form a chamber 182 into which the valve 51 projects.

. The combined pressures of the springs 179 will be such that the force, tending to move the rod 44, will reach a predetermined value before the rod 44 is released from the detents.

The provision of the chamber 138 affords opportunity to immerse the friction parts of the mechanism in alubricant andif a liquid is employed for the power Huid, it is desirable that said power fluid be maintained separate from the lubricant. If, for example, oil is to be used as the power fluid, said oil may be, or may become, charged with foreign particles that it isI desirable to exclude from the lubricant in the chamber 138. lVhile this may be approximately attained-without the use of any special device, it will be readily understood that because of movement of the rod 44 in and out seating at one end against cant might, in the course of time, becomeA mixed therewith, and the heavier particles, at least, and, more especially, foreign particles, might gravitate downwardly and finally enter the chamber 138. To avoid this, I preferably extend the duct 183 upwardly above the upper end of the head 109, thence downwardly so that the outer end of said duct opens downwardly as indicated at 184, thus making it practically impossible for foreign particles to enter the duct and,

`in fact, tending to prevent mixing of the lubricant with the power oil.

At the highest point in the duct 183 is a filling opening 185 normally closed by a plug 186. After the valve mechanism is assembled, the lubricant will be supplied through the opening 185 up to the level A where the duct turns downwardly and the plug 186 will then be screwed in the saidopening.. The lling will be effected when the rod 44 is at the lower end of its stroke and, thus, when the power fluid is in the tubing 23, it will ascend to meet the level of the lubricant. When the rod 44 moves upwardly, the lubricant in the duct 183 will be forced down the duct toward the open end 184 and, hence, power oil will surge up and down in the short leg of the duct and not tendto mix with the lubricant.

The valve mechanism described above operates as follows: it will be assumed that the power fluid is supplied to the tubing 23 under pressure by the pump, that the valves 49, 51 are closed, -and valves 48, 50 open,'

The connection betweenthe rod 44 and the piston is such that there will be a certain amount of lost motion between the rod and the piston on both strokes of the piston. Assuming, then, that the piston has descended sufficiently far to pull the rod 44 downwardly, thus releasing it from the detents 178, said detents will again engage in certain of the notches 177 and hold the rod in its lower position. Downward movel ment of the rod 44 rocks thecams 143, 144,

thus reversing the positions of the valves, opening the valves 49, 51 and closing the valves 48, 50. The power fluid now passes from the tubing 23 through the port 53, thence through the passage 113, tubular section 111, and the passage 115, into the tubing 27, thence to the lower end of the cylinder so as to actuate the piston on its up stroke. The power fluid previously forced into the upper end of the cylinder will now be forced by the piston upwardly past the valve 51, through `the port 58, to the eX- terior of the valve mechanism.

The pump above described operates as follows: Assuming that the working parts of the pump are in the positions shown in the drawings, in other words, that the piston and plunger are at the upper end of their strokes, and that the valves 48, 50 are open and the valves 49, 51 closed, the power fluid in the tubing 15 passes the valve 48 and through the port 52 into the tube 59, thence to the upper end of thev cylinder above the piston 45, forcing said piston downwardly and with it the pump plunger.

On the down stroke of the plunger, 'the standing valve 33 is closed and the plunger valves 37, 38 opened to admit fluid from beneath the plunger to the interior of. said plunger and to the space within the cylinder above the plunger. On the down stroke, the rod section 41 passes into the upper end of the working barrel, displacing Some of the fluid from said working barrel through the ducts 80, chamber 79 and ports 81 into the tube 56, and fluid in the tube 56 is .forced upwardly through the ducts 82, thus displacing the fluid inthe casing above the packer from said casing into the pipe line 84. .The power fluid in the cylinder below the piston is forced by the descending piston out through theL ports past the .valve 50 through the port 54 into the tube 56. This exhaust power fluid then ascendswith the fluid being pumped.

When the piston descends to a po1nt that causes engagement of-the piston with the shoulder 46, said piston actuates the rod 44 which operates the valve mechanism to close the valves 48, 50 Aand open the valves 49, 51. The power fluid then passes from the tubing 15 into the port 53, thence through the tub- I 7ing 27 and ports 29 to the lower end of the cylinder below the piston, thus driving said piston upwardly. The -power fluid above the piston is now forced by the ascending piston through the tube 27, thence past the valve 51 through the port 58 into the upwardly ascending fluid being pumped within the tube 56. The ascending piston carries with it the pump plunger, the valves 37, 38 of which close and the plunger thus raises i the fluid thereabove so that said fluid passes 29 into the tube 27, thence upwardly the same as hereinbefore described for downward motion of the plunger.

When the plunger moves upwardly the standing valve 33 opens, thus admitting Huid from the well into the working barrel. When the piston rises sufliciently far to engage the shoulder 47 on the rod 44, it actuatessaidrod which, in turn, operates the valve mechanism 26 so as to againopen the valves 48, 50 and close the valves 49, 51. The foregoing described cycle will then be repeated as long as the power fluid is supplied to the tubing 15.

In the operation of. setting the packer, when the tubing 15 is turned to effect increasing of the packer member 62 from the packer member 64, the member 64 is held againsty turning by reason of the frictional grip of the lower end of the gas anchor 34 ygas anchor with a number of radial arms In the instance illustrated, the packing material 66 is enclosed by a sleeve 87 of readily rupturable material such, for eX- ample, as thin copper, so as to protect the packing material from friction with the casing when tlie packer is being lowered into the well. lVhen the packer is released, as hereinbefvore described, the thin metal sleeve 87, if it has not previously been ruptured by the outward pressure against it, will rub on the rough inner surface of the casing and in consequence will quickly disintegrate, thus allowing the packing material 66 to contact with the casing and be disintegrated in its turn.

I claim:

1. A fluid-operated pump comprising inner and outer tubings, the outer tubing provided with a perforated portion, a packer between the tubings and above the perforations, a. working barrel in the outer tubing below the packer connected to discharge the pumped Huid into-one of said tubings, a standing-valve for the Working barrel, a valved plunger in the barrel, a fluid 'operated motor in the inner tubing operably connected with the plunger, and a valve mechanism connected with the tubing that does not receive the pumped fluid operable by the motor to control the flow of an operating-fluid under pressure from said last mentioned tubing to the motor.

2. A fluid-operated pump comprising inner and outer tubings, a means operable from a retracted condition into an expanded condition to separate one of the tubings into upper and lower passages, and a means operable by a power fluid within the inner tubing to pump a liquid from the lower passage through the upper passage. f

3. A fluid-operated pump comprising inner and outer tubings, a means .operable from a retracted condition into an expanded condition by relative motion between the tubings to separate the outer vtubing into upper and lower passages, and a means operable by a power Huid within the linner tubing to pump a liquid from the lower passage through the upper passage.

4. A fluid-operated pump comprising inner and outer tubings, a packer operable by downward movement of the inner tubing from a retracted `position into an expanded position to separate the outer tubing into upper and lower passages, said packer releasable by upward movement of the inner tubingand a means operable by a power fluid within the inner tubing to pump a liquid from the lower passage through the upper passage.

5. A fluid-operated pump comprising inner and outer tubings, a packer`between the tubings separating the outer tubing into upper and lower passages, a tube sealed to the packer at its upper end, the packer provided with ducts therethrough communicating with the bore of said tube, a working barrel communicating at its upper end with the bore of the tube, a standing valve for the working barrel, a valved plunger in the working barrel, a fluid 'operated motor operably connected with the plunger, and a valve mechanism operable by the motor to control thefflow of an operating fluid under pressure within the inner tubing to the motor. o

6. A fluid-operated pump comprising inner and outer tubings, a packer between the tubings separating the-outer tubing into upper and lower passages, a tube sealed to the packer at its upper end, the packer provided with ducts therethrough communicating with the bore of said tube, a work? ing barrel communicating at its upper end with the bore of the tube, a standing valve for the workingbarrel, a valved plunger in the working barrel, a cylinder, a piston in the cylinder operably connected with' the plunger, a tube surrounding the cylinder and communicating at its lower end with the lower portion of the cylinder, and a valve-mechanism operable'by movement of the piston to admit power fluid from the inner tubing to the upper ends of the cylinder and last mentioned tube and to exhaust the power fluid from the upper ends of the cylinder and last mentioned tube into the lirst mentioned tube.

7. A fluid-operated pump comprising inner and outer tubings, a packer between the tubings separating the outer tubing into upper and lower passages, the inner tubing formed of sections, one section telescoped within another, the inner section having a pcrforate portion spaced from the outer tubing, a standing valve for the working barr'el, a Valved'plunger in the working barrel,

A,a fluid operated motor operably connected .with the ycontrolling the iow of power fluid from the plunger, and a valve mechanism perforate section to the motor.

8. A fluid-operated pump comprising inner and outer tubings, a packer between the tubings separating the outer tubing into upper and lower passages, a tube sealed to the packer at its upper end, the packer provided with ducts therethrough communicating with the bore of said tube, a seat member connected with the lower end of the tube, a

`coupling member loosely engaging the seat Va valve mechanism operable by movement of the piston to admit power fluid from the inner tubing to the upper ends of the cylinder and last mentioned tube and to exhaust the power fluid from the upper ends of the cylinder and last mentioned tube into the first mentioned tube. i 9. A fluid-operated pump comprising inner and outer tubings, a packer between the tubings separating the outer tubing into upper and lower passages, a tube sealed to the packer at its upper end, the packer provided with ducts therethrough communicating with the bore of said tube, a seat member connected with the lower end of the tube, a coupling member loosely engaging the seat member and provided with a port communicating with the bore of the tube, a working barrel connected with the coupling member and communicating with the port, a standing valve for the working barrel, a valved plunger in the working barrel, a fluid operated motor operably connected with the plunger, and a valve mechanism operable by the motor to admit power fluid fromthe inner tubing to the motor and to exhaust power fluid from the motor into the tube.

l0. A fluid-operated pump comprising inner andouter tubings, a means to separate one of the tubings into upper and lower passages, the inner tubing connectingwith the upper passage through the separating means, fluid-operated means within the outer tubing to pump a liquid from the lower passage into the inner tubing, a tube connected with said pumping means to supply a power fluid to the pumping means to operate said pumping means and having a perforate upper end portion, and a power ud supply tube telescoped over and snugly fitting the last-mentioned tube, the perforate portion being spaced from the tube that telescopes over it to permit the fluid to flow through the perforations.

Signed at Los Angeles, California, this 2nd day of June, 1928.

PAUL F. YUNGLING. 

